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Richard Erlacher
11/27/12 10:16
Read: 533 times
Denver, Co

#188917 - Yes it can ...
Responding to: Stefan Kanev's previous message
However, I'd guess that the system won't be at a temperature outside the commercial or industrial temperature range all the time. Once the system is started, so long as power doesn't fail, the low-cost MCU can control the temperature. The crux, I suppose, is figuring out how to manage the situation in which the power does drop out at low temperature.

Restarting at low temperature means that the heater has to come on when the MCU or whatever controls it isn't operating, yet only when it's too cold, and that mechanism has to ensure that the entire system is within its safe operating temperature range before attempting to start it.

Further, there's the risk that the low-cost MCU fails. it's probably necessary to provide for that in the main MCU. I'm thinking that the main MCU has to ensure the system doesn't get too warm, and the auxilliary MCU has to prevent it getting too cold. Something has to ensure that the system is within temperature range before it's started. That means it has to be independent of the MCU's, oscillator, etc. so that no component is being operated outside its specified safe operating temperature range. There's probably a relatively simple way to do that, and the auxilliary MCU might not even be needed.


List of 27 messages in thread
-40 degree Celsius operation      Raj Nambiar      11/24/12 03:45      
   Heating pads      Hal Albach      11/24/12 04:15      
   Undefined behaviour!      Andy Neil      11/24/12 04:51      
      bending it in neon      Erik Malund      11/24/12 08:31      
         That means that you're on your own ... no support       Richard Erlacher      11/24/12 08:53      
   Why?      Kai Klaas      11/24/12 08:52      
      Not in Dubai      Raj Nambiar      11/26/12 07:12      
         nobody has been that stupid      Erik Malund      11/26/12 07:47      
         So many pitfalls...        Oliver Sedlacek      11/26/12 10:18      
            testing      Erik Malund      11/26/12 12:49      
               And what is the cost of testing?      Kalpak Dabir      11/27/12 22:10      
                  the cost of testing      Andy Neil      11/29/12 00:54      
                     it's not just pass/fail ...        Richard Erlacher      11/30/12 09:47      
                        Tell me about it!      Andy Neil      11/30/12 11:24      
                        Why?      Erik Malund      11/30/12 14:13      
                           Why??? It's to protect your own gluteus maximus      Richard Erlacher      11/30/12 15:28      
         what would happen       Andy Neil      11/26/12 23:42      
   Heaters/controllers      Joseph Hebert      11/24/12 20:31      
   Low temp components      Oliver Sedlacek      11/26/12 02:45      
      Potting wont help       Andy Neil      11/26/12 23:45      
         it's probably less costly to heat a small enclosure      Richard Erlacher      11/27/12 00:08      
            at very cold start...      Stefan KAnev      11/27/12 06:18      
               Yes it can ...      Richard Erlacher      11/27/12 10:16      
   it's not that simple ...       Richard Erlacher      11/27/12 00:13      
      heater      Erik Malund      11/27/12 07:25      
         With an NTC resistor driving the base?      Oliver Sedlacek      11/27/12 08:35      
            It's very simple...      Kai Klaas      11/28/12 05:37      

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